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Yield sign
In road transport, a yield (Canada, Ireland, South Africa, South Korea and the United States along with many countries in the World) or give way (United Kingdom, other Commonwealth and English-speaking countries) traffic sign indicates that each driver must prepare to stop if necessary to let a driver on another approach proceed. A driver who stops or slows down to let another vehicle through has yielded the right of way to that vehicle. In contrast, a stop sign requires each driver to stop completely before proceeding, even if no other traffic is present. Particular regulations regarding appearance, installation, and compliance with the signs vary by jurisdiction.
==History==
A black triangle (within the standard down-arrow-shape of stop signs) was a symbol of "stop for all vehicles" since about 1925 in Germany. The triangular yield sign was used as early as 1938 when it was codified in Czechoslovakia in a blue-white variant without words〔Government ordinance No. 100/1938 Sb. n. a z., Czechoslovakia〕 and in 1939 in the Protectorate of Bohemia and Moravia which adopted the current red-white variant.〔Government orinance No. č. 242/1939 Sb. (Protectorate of Bohemia and Moravia)〕
In the United States, the first yield sign was installed in 1950 at First Street and Columbia Avenue Tulsa, Oklahoma, having been devised and designed (apparently independently) by Tulsa police officer Clinton Riggs.
Riggs invented only the sign, not the rule, which was already in place.〔(【引用サイトリンク】title=A Brief History of Yield Signs )〕 The sign as originally conceived by Officer Riggs was shaped like a keystone; later versions bore the shape of an inverted equilateral triangle in common use today.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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